Step * of Lemma fpf_dom_compose_lemma

f,g,x,eq:Top.  (x ∈ dom(g f) x ∈ dom(f))
BY
(UnivCD THENA Auto) }

1
1. Top@i
2. Top@i
3. Top@i
4. eq Top@i
⊢ x ∈ dom(g f) x ∈ dom(f)


Latex:


\mforall{}f,g,x,eq:Top.    (x  \mmember{}  dom(g  o  f)  \msim{}  x  \mmember{}  dom(f))


By

(UnivCD  THENA  Auto)




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